A Rotational Speed Sensor Based on Flux-Switching Principle

Duy-Tinh Hoang, Joon-Ku Lee (), Kwang-Il Jeong, Kyung-Hun Shin () and Jang-Young Choi ()
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Duy-Tinh Hoang: Department of Electrical Engineering, Chungnam National University, Dajeon 34134, Republic of Korea
Joon-Ku Lee: Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
Kwang-Il Jeong: Korea Atomic Energy Research Institute, Daejeon 34057, Republic of Korea
Kyung-Hun Shin: Department of Electrical Engineering, Changwon National University, Changwon 51140, Republic of Korea
Jang-Young Choi: Department of Electrical Engineering, Chungnam National University, Dajeon 34134, Republic of Korea

Mathematics, 2025, vol. 13, issue 8, 1-20

Abstract: This study proposes a rotational speed measurement machine based on the flux-switching principle with a 6-stator-slot/19-rotor-pole (6s/19p) topology. With a rotor shape similar to a variable reluctance sensor (VRS), the proposed machine features a simple and robust structure while ensuring the same output frequency as VRS. Additionally, compared to the conventional 12s/10p topology, the 6s/19p configuration reduces permanent magnet (PM) consumption by half while maintaining high induced voltage characteristics. A nonlinear analytical model (NAM), which incorporates the harmonic modeling (HM) technique and an iterative process, is presented. This model more accurately captures the rectangular shape of the PM and stator teeth while accounting for core saturation effects. Based on this model, the optimal dimensions of the proposed machine are investigated to achieve the best performance for speed measurement applications. A coupling FEA simulation between Ansys Maxwell and Twin Builder further analyzes the machine’s performance. Compared to a commercial product of the same size, the proposed machine achieves 31.5% higher output voltage while ensuring lower linearity errors. Moreover, superior load characteristics are observed, with a voltage drop of only 1.58% at 1500 rpm and 30 mA. The proposed machine and NAM provide an improved solution and analytical tool for speed measurement applications.

Keywords: analytical model; finite element analysis; flux switching; harmonics modeling; magnetic sensor (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2025
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